DEVICE FOR IMPROVING RELIABILITY IN OPERATION AND REPAIR OF WELLS Russian patent published in 2000 - IPC

FIELD: gas and oil production industry. SUBSTANCE: device can be used in repair of producing wells in case of breaking of pipes. Device has hollow cylindrical body with external threaded slips secured on body of device. Slips can displace along body. Centralizer and head-piece are also mounted on cylindrical body. Made in lower part of body in its side surfaces are three inclined planes with longitudinal protrusions with slips mounted on them. Centralizer is made in the form of three flat springs. Lower ends of springs are soldered by hard-alloy solder to slip holder. Upper ends of flat springs are bent and protrude beyond diametrical dimension of body. Stroke of slips is from 4 mm to 24 mm. Headpiece is made in the form of cylinder with bevelled lower edge. Headpiece is installed on lower end of body. Application of aforesaid embodiment of device simplifies repair process due to appropriate centering of device during its lowering into well. It ensures reliable gripping at any place in length of pipe to be caught. EFFECT: higher efficiency. 1 dwg